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Filter module based on op amp AD8039

Overview

AD8039 is a two-channel operational amplifier, that is, each chip has two sets of input and output, so there are numbers like U1.1 and U1.2 in the schematic diagram. It looks like two operational amplifiers, but they are actually integrated into one AD8039 chip. Can effectively reduce the circuit size.
The filter structure given in this project is a seventh-order four-stage Butterworth sallen-key high-pass filter, in which the first stage is an RC buffer and two 0Ω resistor positions are reserved. If the first stage RC is not needed, The reserved resistor bits can be replaced with other devices and changed to a sallen-key structure. The -3dB cutoff frequency of the filter circuit is 20kHz, and the -40dB stopband is 10kHz. Due to the characteristics of the sallen-key structure, the position and size of the resistor and capacitor in the circuit can be modified, and the circuit can be modified into a low-pass filter to expand the function.
The output of each intermediate stage has a signal lead and is connected to an SMA interface to facilitate debugging and testing.

Design Files

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Update:2025-06-23 04:22:57

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